[CameronsBettas]

In my experience and from seeing fry from other breeders, almost all fry have a common colour or pattern at a young age and then change colour as they grow

 

[CameronsBettas]

So they all show a blue iridescence when they're a few weeks old and when they reach 6-8 weeks they start to show their true colors?

Not all of them but a lot of them will and the colours they get at 8 weeks usually change again aswell